package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.Shop;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.ArrayList;
import java.util.List;

import static com.hmdp.utils.RedisConstants.CACHE_SHOP_KEY;
import static com.hmdp.utils.RedisConstants.CACHE_TYPE_KEY;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryList() {
        String key = CACHE_TYPE_KEY;
        // 1、从redis查，由于存入的为一个list，注意取数据时也要使用list
        List<String> list = stringRedisTemplate.opsForList().range(key, 0, -1);
        // 2、判断
        if (list != null && !list.isEmpty()) {
            List<ShopType> typeList = new ArrayList<>();
            for (String s : list) {
                typeList.add(JSONUtil.toBean(s, ShopType.class));
            }
            return Result.ok(typeList);
        }
        // 不存在， 到数据库查
        List<ShopType> typeList = this.query().orderByAsc("sort").list();
        List<String> RedisList = new ArrayList<>();
        for (ShopType shopType : typeList) {
            RedisList.add(JSONUtil.toJsonStr(shopType));
        }
        // 存在， 写入redis
        stringRedisTemplate.opsForList().rightPushAll(key, RedisList);

        return Result.ok(typeList);
    }
}
